Post on 01-Jun-2020
ORIGINAL RESEARCH
Use of pineapple waste for production of decomposable pots
I. Jirapornvaree1 • T. Suppadit2 • A. Popan3
Received: 7 June 2017 / Accepted: 23 October 2017 / Published online: 28 October 2017
� The Author(s) 2017. This article is an open access publication
Abstract
Purpose The aim of this research was to evaluate the
suitability of pineapple waste for production of decom-
posable nursery pots.
Methods The experiment was completely randomized,
with three replicates and eighteen formula treatments.
Treatments consisted of varying ratios of pineapple waste
to binder, including 2:1, 1:0 (fresh pineapple waste), 1:1,
1:1.5, and 1:2; the textures tested were coarse, medium,
and fine, and the pot thicknesses were 0.5, 1.0 and 1.5 cm.
Results The results revealed that the physical and chemical
properties of pineapple waste were suitable for use in
nursery pots on an experimental scale. The optimal phys-
ical and chemical properties for a decomposable pot
included a 1:0 ratio of pineapple waste to binder, a coarse
structure, and a pot thickness of 1 cm. With these proper-
ties, the pot degraded in more than 45 days, N and P
release rates were 0.49% and 7.97 mg-P/kg, respectively,
and the average absorption rate was 258.43%. Saturation
occurred in 45 min, and the water evaporated in 444 h.
Conclusion In terms of cost production per pot, fresh
pineapple waste cost 0.0075 USD for a three-and-a-half
inch diameter decomposable pot (excluding logistical
costs). Therefore, this study provides a possible method for
waste management.
Keywords Agricultural waste � Eco-product � Pineapplecannery industry � Waste management
Introduction
Sustainable development has been defined in many ways to
develop industrial sustainability to move toward a low-
carbon society. Thailand’s economic growth in the past two
decades has dramatically increased consumption of natural
resources in the industrial, agricultural, and household
sectors. The 2015 Thailand state of pollution report found
that the quantity of hazardous waste in the country was
3.445 million tons. The contribution of Thailand’s indus-
trial sector was 2.8 million tons, or 81.5%. At present, the
use of recycled materials is a major trend in industrial
waste management (Chandak 2010).
In 2015, there were approximately 13.60 million tons of
recyclable industrial waste consisting of glass, paper,
plastic, steel, aluminum and rubber. Of that, approximately
8.20 million tons or 65.73% were either re-processed/
reused (3.55 million tons or 43.29%) or supplied to the
waste exchange system (3.45 million tons or 42.07%).
Compared with 2014, usage of recyclable industrial waste
decreased by 1% (Pollution Control Department 2015).
The pineapple industry in Thailand is now the fourth
largest producer and exporter of pineapple in the world
& I. Jirapornvaree
ittisakji@gmail.com
T. Suppadit
tawatc.s@nida.ac.th
A. Popan
Apisakp9@gmail.com
1 Center for Competitiveness Research, Research Center,
National Institute of Development Administration,
Bangkok 10240, Thailand
2 Graduate School of Environmental Development
Administration, National Institute of Development
Administration, Bangkok 10240, Thailand
3 Department of Soil Resource and Environmental
Management, Faculty of Agriculture Technology, King
Mongkut’s Institute of Technology Ladkrabang,
Bangkok 10520, Thailand
123
Int J Recycl Org Waste Agricult (2017) 6:345–350
https://doi.org/10.1007/s40093-017-0183-5
(Office of Agricultural Economics 2016). Average annual
production is 1.79 million tons (Food Intelligence Center
Thailand 2015). Currently, Thailand has 75 pineapple
processing companies that generate approximately 200
tons of waste per day (Ritthisorn et al. 2016). Thus, studies
have focused on producing things such as fertilizer and
calcareous soil improvement (Ch’ng et al. 2013; Thongpae
et al. 1992), animal food (Youburee 2003), and supple-
mentary food from pineapple fiber extraction (Upadhyay
et al. 2010; Utama-ang and Tepjaikad 2001).
Therefore, this study aimed to use pineapple waste from
the cannery industry to produce decomposable pots, with
the hope of replacing plastic plant nursery bags and
reducing waste. Moreover, this method provides an alter-
native usage for pineapple waste and adds value to the
byproduct. It also aligns with current trends in ecologically
sustainable products.
Materials and methods
Preparation of pineapple waste and binder
1. The pineapple waste was baked for 24 h at tempera-
tures between 65 and 75 �C.2. The pineapple waste was ground so that coarse,
medium, and fine textures could be tested.
3. The binder was prepared with a 1:5 ratio of tapioca
starch to water.
4. The pineapple waste was mixed with binder.
Experimental design
1. To produce the decomposable pots, ratios of pineapple
waste to binder tested were 2:1, 1:0 (fresh pineapple
waste), 1:1, 1:1.5, 1:2 and 1:3, along with pot thick-
nesses of 0.5, 1.0 and 1.5 cm. Then, the pots were
baked at approximately 65 �C for 12 h.
2. Soil was packed into the decomposable pots.
3. The experimental design was completely randomized
(CRD).
4. Pots were regularly watered every day, one at a time,
with the same amount of liquid. Observations were
made, and watering was stopped when decomposable
pots were broken beyond repair.
5. Total Kjeldahl nitrogen (TKN) was determined after
digesting the sample with concentrated H2SO4 (1:20,
w/v) followed by distillation and titration (Bremner
and Mulvaney 1982). Total phosphorus was analyzed
from the wet digest (HClO4) and was estimated by the
colorimetric method using ammonium molybdate in
hydrochloric acid. Absorption rate was measured by
weighed and recorded the value of each pot that was
immersed in water every 5 min until saturation point
and evaporation rate was measured by recorded the
changed weight of saturated pot every 12 h until the
weight of the pot was reached the same as initial
weight of dry pot (Krinara 2011).
Data analysis
The data were analyzed using an F test (One-way Analysis
of Variance) and SAS software. SAS System version 9.0
for Windows was used to test for differences between
factors.
Results and discussion
Physical and chemical properties of pineapple waste
Table 1 shows that pH of the pineapple waste was neutral
over time (Perez et al. 1973). Electrical conductivity was
low, and the salt and moisture levels of pineapple waste
were suitable for manufacturing decomposable pots. Total
nitrogen remained at moderate levels and could be used as
fertilizer for the plant (Espinosa et al. 2012). Total phos-
phorus was low (relative to phosphorus in the soil), and
additional fertilizer could be added to nourish the plant.
Thus, pineapple waste was suitable to be used as material
for research (Schettinia et al. 2013).
Ratio of tapioca starch and water in binder
production
This study found that a suitable ratio of binder to tapioca
starch ranged from 1:1 to 1:9. However, the most cost-
effective ratio of binder to tapioca starch was 1:5, followed
by 1:6 and 1:7. Ratios of 1:1, 1:2 and 1:3 were the least
cost-effective. Therefore, this study recommended using a
1:5:1 ratio of tapioca starch to water to pineapple waste for
conducting experiments and developing a product (Leach
1965; Srirod and Piyachomkwan 2003).
Table 1 Physical and chemical properties of pineapple waste
Physical and chemical properties Before After
pH 6.96 5.93
Electrical conductivity; EC (lS) 1.87 3.57
Moisture (%) 70.94 –
Total nitrogen; TN (%) 0.56 0.31
Total phosphorus; TP (mg-P/kg) 6.14 6.10
346 Int J Recycl Org Waste Agricult (2017) 6:345–350
123
Optimum size of pineapple waste texture
in decomposable pot production
Pineapple waste textures can be categorized into coarse,
medium and fine, as shown in Fig. 1.
Table 2 shows that the sizes of pineapple waste textures
influenced the production of pots. The coarse texture and
the waste condition resemble a fabric weave after pro-
duction. The resulting strength of the coarse-texture pot
was the most appropriate (Sopunna et al. 2015; Suka-
neeyuth et al. 2014). This study found that coarse pineapple
waste of any ratio can be molded into product. The medium
size texture was less suitable, as the binding was relatively
soft. In contrast, the fine-textured pineapple waste was the
least appropriate texture because of its production costs.
Optimum thickness of decomposable pots
Thickness was tested by producing decomposable pots
using the procedure in steps 1 through 5 (different thick-
nesses used in step 5 included 0.5, 1.0, 1.5, 2.0 and
2.5 cm). Then, the pot was filled with soil, and perfor-
mance was analyzed.
This study found that decomposable pots with thick-
nesses of 0.5, 1.0 and 1.5 cm could be formed and filled
with soil, as shown in Fig. 2. Conversely, pots with
thicknesses of 2.0 and 2.5 cm could be produced, but their
resulting volume was not suitable for holding soil.
Nutrient release during degradation; absorption
and evaporation properties of decomposable pots
Ratio of degradation
Study of nutrient release during degradation indicated that
the optimum degradation time of a nursery pot was more
than 45 days, as shown in Table 3. In other words, the
degradation rate was the time to decomposition within a
defined period. A total of 15 formulas, such as 1:2 and 1:0
(pineapple waste:binder) satisfied this optimum condition,
although a 1:1 ratio could only be tested with a coarse
texture. The remaining ratios had decomposition times of
less than 45 days.
Ratio of nutrient release
The combinations of pineapple waste to binder ratio, tex-
ture and thickness used in this study are shown in Table 3.
This study compared the emission of nitrogen at dif-
ferent ratios; for the formula, a significance level of 0.05
was chosen to indicate differences. Formulas 4, 11 and 12
averaged 0.340, 0.485 and 0.350% nitrogen, respectively,
and were not different from each other but were different
from the other formulas. The nitrogen content of for-
mula 11 was different from the other formulas. The aver-
age percent nitrogen is shown in Table 3.
This study also compared the emission of phosphorus
during degradation at a significance level of 0.05. Formu-
las 11 and 10 averaged 7.97 and 7.06 mg-P/kg,Fig. 1 Size of pineapple waste textures, from left: coarse, medium,
and fine
Table 2 Forming size capabilities of pineapple waste textures
Ratio (waste: binder) Thickness (cm) Texture
Coarse Medium Fine
1.0:2 0.5 4 4 4
1.0 4 4 4
1.5 4 4 4
1.0:0 0.5 4 NA NA
1.0 4 NA NA
1.5 4 NA NA
1.0:1 0.5 4 4 4
1.0 4 4 4
1.5 4 4 4
1.5:1 0.5 4 4 7
1.0 4 4 7
1.5 4 4 7
2.0:1 0.5 4 4 7
1.0 4 4 7
1.5 4 4 7
NA not available because pineapple waste of that ratio could not be
ground into medium and fine textures
Fig. 2 Thickness of decomposable pots, from left: 1.5, 0.5 and
1.0 cm
Int J Recycl Org Waste Agricult (2017) 6:345–350 347
123
respectively, and were not statistically different from each
other but were different from the other formulas. Formu-
las 12, 10 and 9 averaged 7.27, 7.06 and 6.34 mg-P/kg,
respectively, and were not different from each other but
were different from all other formulas. Finally, formula 17
averaged 5.20 mg-P/kg and was significantly different
from formulas 9, 10, 11 and 12. The average percent
phosphorus is shown in Table 3.
Results indicated that the ratio of pineapple waste to
binder, texture of the waste and thickness significantly
affected emissions of nitrogen and phosphorus (p\ 0.05).
Moreover, in terms of horticultural performance, the
biodegradable pots did not cause damage to the plants
during the test period (Schettinia et al. 2013).
Rate of absorption
This study compared the absorption volume of different pot
formulas, at time intervals of 35, 40 and 45 min. A sig-
nificance level of 0.05 was used to assess differences
between of the formulas. Although all formulas were dif-
ferent, the best formula was 12. The average absorption
volume of the formula 12 pot in 5 min was 200.76, which
was inversely proportional to the absorption time. In
40 min, the total average absorption volume was 267.64.
The 5-min absorption volumes for formulas 3 and 7 were
55.83 and 61.87, respectively. These values were signifi-
cantly different from the rest of the results and inversely
proportional to the absorption time. Their average
absorption volume in the 35 and 45 min trials were 125.82
and 131.21, respectively.
The data revealed that, initially, the pots absorbed large
quantities of water. Absorption gradually increased to a
saturation point. The average rates of water absorption are
shown in Fig. 3 and Table 3.
First, the adsorption rate depended on the texture and
pore surface of the decompose pots because the cohesive-
ness between textures was different, as shown in Fig. 4.
Second, the decomposable pot extrusion process showed
that the coordination of materials was different for each
surface material. The coarse texture was not smooth. Its
absorption rate was higher than that of the fine texture. The
particles of water easily infiltrated through the texture pot.
Third, the quantity of binder showed an inverse relation-
ship with absorption rate. Lastly, water absorption depen-
ded on the size and number of gaps between particles
(pores) in the texture.
Rate of evaporation
This study compared the evaporation time of the different
decomposable pots, and significance was assessed at the
Table 3 Degradation, nutrient release, absorption and evaporation properties of decomposable pots
Formula Waste:binder Texture Thickness
(cm)
Degradation
(days)
Total nitrogen
(%)
Total
phosphorus
(mg-P/kg)
Absorption
(ml)
Evaporation
(h)
1 1:2 Coarse 0.5 [45 0.280b 5.645de 181.06f 408c
2 1.0 [45 0.305b 6.125cde 206.53c 408c
3 1.5 [45 0.305b 5.935de 186.62ef 408c
4 Medium 0.5 [45 0.340ab 5.450de 136.98hg 360d
5 1.0 [45 0.305b 6.240cd 191.71ed 408c
6 1.5 [45 0.305b 5.880de 203.29c 408c
7 Fine 0.5 [45 0.265b 5.760de 125.82i 360d
8 1.0 [45 0.305b 5.655de 131.21hi 360d
9 1.5 [45 0.265b 6.335bcd 143.77g 360d
10 1:0 Coarse 0.5 [45 0.330b 7.060abc 195.70d 408c
11 1.0 [45 0.485a 7.970a 258.43b 444a
12 1.5 [45 0.350ab 7.270b 267.64a 432b
13 1:1 Coarse 0.5 45 0.310b 5.995de – –
14 1.0 45 0.280b 6.150cde – –
15 1.5 45 0.300b 5.700de – –
16 1.5:1 Coarse 0.5 36 0.285b 5.500de – –
17 1.0 35 0.295b 5.195e – –
18 1.5 31 0.305b 5.970de – –
Values followed by letters represent values of total nitrogen, total phosphorus, absorption and evaporation that are significantly different from the
other measurements (p\ 0.05)
348 Int J Recycl Org Waste Agricult (2017) 6:345–350
123
0.05 level (p\ 0.05). Formula 8 had an evaporation rate of
43.23 during the first 36 h and was distinct from the other
formulas. The evaporation rate of formula 8 was inversely
related to the time of evaporation (444 h). On the other
hand, formulas 2, 3, 7 and 11 were not different from each
other but were different from all other formulas. They
averaged 34.54, 45.24, 38.79 and 45.15, respectively, and
were inversely related to the time of evaporation (360 h).
The evaporation rate of water could not be measured
directly, so it had to be measured by comparing the total
amount of water evaporated from the material with the
amount of water or weight lost each day. The study of
evaporation rates revealed two main results. First, the air
temperature at the surface affected the evaporation rate less
than the time of evaporation at room temperature; the
decomposable pots could absorb water and retain moisture
for a period of 2–3 days. Second, the size of the surface
textures affected the evaporation rate, as water in coarse-
0
50
100
150
200
250
300
0 10 20 30 40 50 60 70
Abs
orpt
ion
rate
(%)
Water absorption duration (minutes)
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
Fig. 3 Water absorption test
results
Fig. 4 Surface texture of decomposable pots, from left: coarse,
medium and fine
0
50
100
150
200
250
300
0 50 100 150 200 250 300 350 400 450 500
The
am
ount
of w
ater
rem
aini
ng in
the
pot (
%)
The evaporation time (hours)
F1
F2
F3
F4
F5
F7
F8
F9
F10
F11
F12
F6
Fig. 5 Evaporation test results
Int J Recycl Org Waste Agricult (2017) 6:345–350 349
123
texture pots evaporated more slowly than water in fine
texture pots, as shown in Fig. 5 and Table 3.
Conclusions
The results of this research showed that size of pineapple
waste textures and pot thickness were different. Both sig-
nificantly affected degradation, nutrient release, absorption
and evaporation (p\ 0.05). The most suitable formula
included a 1:0 ratio of pineapple waste to binder, a coarse
texture and a pot thickness of 1 cm. Manufacturing pots
using this formula successfully resulted in a decomposable
pot with release rates of N and P of 0.34 and 7.97,
respectively. The average volume of absorption was 267.64
in 40 min. The average time of evaporation was 444 h. The
decomposition times were more than 45 days.
Moreover, the physical and chemical properties of
pineapple waste (before and after pot production) were not
harmful to the environment and were a benefit to crops.
Furthermore, the study found that the cost of producing the
products was low. First, the cost of production per pot for
pineapple waste (fresh) at a three-and-a-half inch diameter
was 0.0075 USD (excluding logistical costs). This case
study showed the limitations of using pineapple waste.
Thus, with a small volume of pineapple waste. Second, the
cost of production per pot for dried pineapple waste at a
three-and-a-half inch diameter was 0.03 USD (excluding
logistical and energy costs).
Finally, using pineapple waste from the cannery industry
to produce decomposable pots adds value to the byproduct
and reduces disposal costs. Instead of using pineapple
waste to produce ethanol, extracted fibers, paper products
and decomposable pots could be alternative solutions to
utilize pineapple waste (Schieber et al. 2001).
Open Access This article is distributed under the terms of the
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tivecommons.org/licenses/by/4.0/), which permits unrestricted use,
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